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Non-Greasy Moisturizing Magnesium Oil from the Ancient Zechstein SeaNourishes Softens and Moisturizes skinPure Magnesium Chloride Brine from the Ancient Zechstein SeaApply Before Showering or BathingMined from deep underground at the site of the ancient Zechstein Sea in The Netherlands Swanson Ultra Magnesium Oil is a super-saturated combination of pure magnesium chloride and water—nothing added nothing taken away. Suitable for daily use. It's non-greasy and absorbs rapidly leaving little residue and no unpleasant scent. Magnesium oil consists of a supersaturated solution of magnesium chloride and pure water.